Apparatus for baking wafers, &amp;c.



N0.721,4 55.; APATENTED FEB.24,1903I H. W. MACKENZIE.

APPARATUS FOR BAKING WAFERS, 6w."

' AiPLIOATION FILED we. 26, 1902. no MODEL. I '2 SHEETS-SHEHT-l.

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No. 721,455. i PA-TENTED FEB. 24, 1903.

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. APPARATUS FOR, BAKIMi- WAFERS, 6w.

APPLIOATLQIL 2mm, me 26, 1902. A

no MODEL. 2' SHEETS-SHEET 2.

F1 E1 2 L O JCT THE "cams pzrzas ca, wuorouma. WASHINGTON. D c

UNITED STATES PATE T OFFICE.

'I-IUGH WATSON MACKENZIE, F EDINBURGH, SCOTLAND.

APPARATUS FOR BIAKING .WAFERS, 8w.

SPECIFICATION forming part of Letters I'atent No. 721,455, datedFebruary 24, 1903. Application filed August 26, 1902-, $erial No.121,078. (No model.)

To aZZ whom it may concern.-

Be it known that I, HUGH WATSON MAO- KENZIE, a subject of the King ofGreat Britain and Ireland, and a resident of 22 Upper Grove Place,Edinburgh, in the county of Edinburgh, Scotland, have invented a certainnew and useful Apparatus for Baking Wafers and the Like, (for whichIhave made application for a patent in Great Britain, No. 7,109, hearingdate March 24, 1902,) of which the following is a specification.

This invention relates to apparatus for baking wafers and the like(hereinafter referred to as wafers) in which molds are employedconsisting of plates adapted to be brought face to face and havingmatrices formed in their contiguous faces to receive the material to bebaked 5 and the object of this invention is to fit such matrix-plateswith improved heating devices in which gas is used as theheat-generating medium.

In the accompanying drawings an apparatus for baking wafers is shown inwhich the matrix-plates are fitted with improved heating devicesconstructed according to this invention.

Figure 1 is a central vertical section, and Fig. 2 a plan view of theapparatus with a cover removed.

Upper and lower matrix-plates A and B are secured to the faces ofheat-conducting plates 0 O, which may conveniently be effected by meansof screws C, passing through the conducting-plates and enteringinto thebacks of the matrix-plates. Casings D D are provided and arranged uponthe back surfaces of the conducting-plates O O, and covers E E arefitted on the exterior of the casings, these parts being securedtogether by screw-studs F, as shown. Diaphragms G G, formed in a piecewith the casings D D, extend across the latter. This construction formschambers H H, hereinafter referred to as combustion-chambers, andchambers J J, heI einafter'referred to as mixing chambers. PerforationsL are made in the diaphragms. Exhaust-openings M M, communicating'withthe combustion-chambers H H, are formed in the walls of the casings D Dby employing four distancing or supporting lugs K on each of the casingsD D, which bear upon the surfaces of the conducting-plates C C, and insome cases it may be found desirable to provide additional openin gs Min the walls of the casings in communication with thecombustion-chambers. Apertures N N are provided in the covers E E, to

which pipes having flexible connections,

where necessary, may be connected for conducting a mixture of gas andair to the mixing-chambers J J. The two portionsof the structure arepivotally connected by a pin P, and means-for example, a bolt R,engaging lug S, and an operating-lever T-are provided for securing theparts when in their closed position, and for adjusting the distancebetween the faces of the matrix-plates an adjustable stop-screw W maybefitted in the upper portion of the structure arranged. to bear upon apart of the lower portion. To facilitate the opening and closing of themold, the upper portion of the structure may be balanced.

In action a supply of gas and air under pressure and controlled byregulating-valves is admitted to the mixing-chambers J J, from whence itpasses through the perforations L in the diaphragms G G and is ignitedin the combustion-chambers H H, a series of flames being therebydirected upon the back surfaces of the conducting-plates O O, and thematrix-plates A B are heated by conduction. The products of combustionescape to the atmosphere through the exhaust-openings.

It is to be understood that the conductingplates 0 0 may be dispensedwith and the flames arranged to play directly upon the matrix-plates.Also, if desired, only one plate of the mold may be fitted with theimproved heating device, and, further, in cases where large plates areto be dealt with the mixing and combustion chambers may be subdivided bypartitions arranged vertically to the faces of the diaphragms, eachsubdivision being provided with separate supply apertures andconnections. 4

Having now described my invention, what I claim as new, and desiretosecure by Letters Patent, is

1. In apparatus for baking wafers, the combination with a matrix-plateof a heating device, consisting of, a casing, in which acombustion-chamber and amixing-chamber are formed, thecombustion-chamber being located at the back of the matrix-plate anddivided from the mixing-chamber by a perforated diaphragm, the mixingand combustion chambers being formed with gas supply and exhaustopenings respectively.

2. In apparatus for baking wafers, the combination with eachmatrix-plate employed in the construction of a mold, of a heatingdevice, consisting of, a casing, in which acornbustion-chamber and amixing-chamber are formed, the combustion-chamber being located at theback of the matrix-plate and divided from the mixing-chamber by aperforated diaphragm, the mixing and combustion chambers being formedwith gas supply and exhaust openings respectively.

3. In apparatus for baking wafers, the combination with a matrix-plate,of a heat-conducting plate, a heating device, consisting of, a casing,in which acombustion-chamber and a mixing-chamber are formed, thecombustion-chamber being located at the back of the heat-conductingplate and divided from the mixing-chamber by a perforated diaphragm, themixing and combustion chambers being formed with gas supply and exhaustopenings respectively.

4. In apparatus for baking wafers, the combination with eachmatrix-plate employed in the construction of a mold, of aheat-conducting plate, a heating device,consisting of, acasing,inwhichacombustion-chamberanda mixing-chamber are formed, thecombustionchamber beinglocated at the back of the heatconductingplateand divided from the mixingchamber bya perforated diaphragm, the mixingand combustion chambers'being formed with gas supply and exhaustopenings respectively.

5. In apparatus for baking wafers, the combination with a matrix-plateof a heating device consisting of a casing D, fitted with a cover E,means for securing the casing and cover to the matrix-plate, a diaphragmG, having perforations L, and formed in a piece with the casing D, thewalls of the casing being formed with exhaust-openings, and the cover Ebeing provided with a supply-aperture, arranged and acting substantiallyas and for the purposes set forth.

6. In apparatus for baking wafers, the combination with eachmatrix-plate employed in the construction of a mold, of a heatingdevice, consisting of, a casing D, fitted with a cover E, means forsecuring the casing and cover to the matrix-plate, a diaphragm G, havingperforations L, and formed in a piece with the casing D, the walls ofthe casing being formed with exhaust-openings, and the cover E beingprovided with a supply-aperture, all arranged and acting substantiallyas and for the purposes set forth.

7. Inapparatus for baking wafers, the combination with a matrix-plate,of a heat-conducting plate C, a heating device, consisting of, a casingD, fitted with a cover E, means for securing the casing, cover, andconducting-plate to the matrix-plate, a diaphragm G, having perforationsL, and formed in a piece with the casing D, the walls of the casingbeing formed with exhaust-openings, and the cover E, being provided witha supply-aperture, arranged and acting substantially as and for thepurposes set forth.

8. In apparatus for baking wafers, the combination with eachmatrix-plate employed in the construction of a mold, of aheat-conducting plate O, a heating device, consisting of a casing D,fitted with a cover E, means for securing the casing, cover andconducting-plate to the matrix-plate, a diaphragm G, having perforationsL, and formed in a piece with the casing D, the walls of the casingbeing formed with exhaust-openings, and the cover E being provided witha supply-aperture, arranged and acting substantially as and for thepurposes set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HUGH WATSON MACKENZIE.

Witnesses:

J. P. STRAOHAN, J. ALFRED BREWER.

